MyBatis小问题-Mapper中错误No constructor found... _Constructor

【MyBatis小问题-Mapper中错误No constructor found...】人生难得几回搏，此时不搏待何时。这篇文章主要讲述MyBatis小问题-Mapper中错误No constructor found...相关的知识，希望能为你提供帮助。
前两天又被公司叫去修改其他产品的一些问题了，没有看java相关的，今天周六，看了看MyBatis东西。
就是简单的在mysql中建了个users表，很简单，包含id,name,age，写了个bean。如下：（注，由于初学java，可能很多名词用的并不是特别准确，大概理解一下就行了，待学成之后，再行修改。所谓大行不顾细谨，大礼不拘小节，O(∩_∩)O）

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package com.tszhao.dao;

public class User {

private int id;

private String name;
private int age;

public User(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}

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在JUnit中写了一个测试程序，用来查询。

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@Testpublic void testSelect() {
SqlSessionFactory factory = MyBatisUtils.getFactory();
SqlSession openSession = factory.openSession();
UserMapper mapper = openSession.getMapper(UserMapper.class);
User selectUser = mapper.selectUser(1);
System.out.println(selectUser);
}

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结果，运行报错。。。

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org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: No constructor found in com.tszhao.dao.User matching [java.lang.Integer, java.lang.String, java.lang.Integer]
### The error may exist in com/tszhao/mapper/UserMapper.java (best guess)
### The error may involve com.tszhao.mapper.UserMapper.selectUser
### The error occurred while handling results
### SQL: select * from users where id=?
### Cause: org.apache.ibatis.executor.ExecutorException: No constructor found in com.tszhao.dao.User matching [java.lang.Integer, java.lang.String, java.lang.Integer]
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
...